they then had the dealer 'rotate' the torque converter but that made no difference either

car has been with dealer for past 10 days with BMW saying that the ZF transmission people say this sort of vibration is 'normal' - it is not normal to me when he car bounces enough to start changing lanes from the vibration!

I took mine 2012 650 in, BMW NA engineer took the vehicle for a week and stated it's norm for the vibrate & shakes for the V8. I'm getting in touch with a lemon law lawyer, BMW NA can go "shake & vibrate" with the lawyer.